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- // Distributed under the Boost Software License, Version 1.0.
- // (See accompanying file LICENSE_1_0.txt
- // or copy at http://www.boost.org/LICENSE_1_0.txt)
- // Copyright (c) 2006 Johan Rade
- // Copyright (c) 2011 Paul A. Bristow
- /*!
- \file
- \brief Basic tests of nonfinite loopback.
- \detail Basic loopback test outputs using nonfinite facets
- (output and input) and reads back in, and checks if loopback OK.
- Expected to work portably on all platforms.
- */
- #ifdef _MSC_VER
- # pragma warning(disable : 4702)
- # pragma warning(disable : 4127) // conditional expression is constant.
- #endif
- #include <boost/math/special_functions/nonfinite_num_facets.hpp>
- using boost::math::nonfinite_num_get;
- using boost::math::nonfinite_num_put;
- #include <iostream>
- using std::cout;
- using std::endl;
- #include <locale>
- using std::locale;
- #include <sstream>
- using std::stringstream;
- #include <limits>
- using std::numeric_limits;
- #include <assert.h>
- int main()
- {
- if((std::numeric_limits<double>::has_infinity == false) || (std::numeric_limits<double>::infinity() == 0))
- {
- std::cout << "Infinity not supported on this platform." << std::endl;
- return 0;
- }
- if((std::numeric_limits<double>::has_quiet_NaN == false) || (std::numeric_limits<double>::quiet_NaN() == 0))
- {
- std::cout << "NaN not supported on this platform." << std::endl;
- return 0;
- }
- //locale old_locale; // Current global locale.
- // Create tmp_locale and store the output nonfinite_num_put facet in it.
- //locale tmp_locale(old_locale, new nonfinite_num_put<char>);
- // Create new_locale and store the input nonfinite_num_get facet in it.
- //locale new_locale(tmp_locale, new nonfinite_num_get<char>);
- // Can only add one facet at a time, hence need a tmp_locale,
- // unless we write:
- std::locale new_locale(std::locale(std::locale(std::locale(),
- new boost::math::nonfinite_num_put<char>),
- new boost::math::nonfinite_num_get<char>));
- stringstream ss; // Both input and output, so need both get and put facets.
- ss.imbue(new_locale);
- double inf = numeric_limits<double>::infinity();
- ss << inf; // Write out.
- double r;
- ss >> r; // Read back in.
- BOOST_ASSERT(inf == r); // OK MSVC <= 10.0!
- } // int main()
- /*
- Output:
- nonfinite_loopback_ok.vcxproj -> J:\Cpp\fp_facet\fp_facet\Debug\nonfinite_loopback_ok.exe
- */
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